Readynas 104 won't boot. Error 354 out_of_memory. After upgrade to 6.4.1 #26323717

Following the firmware update I too am now experiencing this problem, with out of memory error 390 on Firmware 6.4.2.

I have 4 x 2TB drives in (i think) raid 5, but may be one of the standard drive array formats that come with this unit. Anyway there is around 6TB of volume space available, of which I am using just over 4TB.

The unit has been sitting under my study desk comfortable for over a year without issue, and on a move around of funiture necessitated me to reboot, and get prompted for a firmware update. Now wishing I had not!

I did notice that there were around 50 snapshot backups on various folders, but other than this there was no other backup in place, so I need to sort out access to offload just over 4TB of data so that any other work on rebuilding the drives can be done if recovery cannot be done in situe. I do not use the management console of this unit that often i.e. once when setting up, and then when doing the firmware upgrade, and the nas just has a shared folder use for document and media storage.

Any help and assistance would be greatly appriciated, as not sure where to start on my recovery journey!